Americans are becoming more open to the idea that aliens have visited Earth, according to a series of polls that show belief in alien visitation has been steadily on the rise since 2012. Almost half—47 percent—of Americans say they think aliens have definitely or probably visited Earth at some point in time, according to a new poll from YouGov conducted in November 2025 that involved 1,114 adult participants. That percentage is up from roughly a third (36 percent) of Americans polled in 2012 by Kelton Research, with the exact same sample size. Just 16 percent of Americans said they were unsure if aliens had visited Earth in the new poll, down from 48 percent who were unsure in 2012. Meanwhile, even as belief in alien visitation has risen, so has doubt: The new poll shows that 37 percent of Americans said Earth likely hasn’t been visited by aliens, more than double the 17 percent logged in 2012.